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What do the unstable isotopes have in common?

Select one:
a. more protons than neutrons
b. an odd number of protons
c. more neutrons than protons
d. an odd number of neutrons
e. an odd number of electrons

Option D I got it right

ANSWER: C (ENERGY WAS RELEASED WHEN THE MOLECULE WAS FORMED FROM ITS ELEMENTS.)

HOPE THE OTHER PERSON IS WRONG!

The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water. This establishes the beginning of energy flow through almost all food webs.

Answer:

Stamens

Explanation:

Answer: 462 g

Explanation:molar mass is M= 63.55 +2·(12.01+14.01)= 115.59 g/mol.

Mass m= n·M = 4.0 mol·115.59 g/mol= 462.36 g

Answer:

The reaction took place is-

Fe + CuSO4 → Fe(SO4) + Cu

the copper salt name is copper sulphate!

The statement describes the name of the copper salt is "copper sulphate."

A salt is an ionic substance that is created when a positively charged ion bonds with a negatively charged ion.

The reaction occurred in the context of the image.

Fe + CuSO4(aq) → FeSO4(aq) + Cu(s)

A single displacement reaction is the sort of reaction. In this reaction, the highly reactive metal iron oxidises and creates ferrous sulphate by replacing the copper in copper sulphate by giving up two electrons.

Hence the correct answer is copper sulphate.

Learn more about salt here,

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Answer: The temperature at pressure of 635.7 kPa is [tex]2033^0C[/tex]

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 107.4 kPa

[tex]P_2[/tex] = final pressure of gas = 635.7 kPa

[tex]V_1[/tex] = initial volume of gas = [tex]515cm^3[/tex]

[tex]V_2[/tex] = final volume of gas = [tex]644cm^3[/tex]

[tex]T_1[/tex] = initial temperature of gas = [tex]38.6^0C=(38.6+273)K=311.6K[/tex]

= final temperature of gas = ?

Now put all the given values in the above equation, we get:

[tex]\frac{107.4\times 515}{311.6}=\frac{635.7\times 644}{T_2}[/tex]

[tex]T_2=2306K=(2306-273)^0C=2033^0C[/tex]

The temperature at pressure of 635.7 kPa is  [tex]2033^0C[/tex]

Answer:Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage. For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water.

Explanation:

Answer: sun is directly over the equator

Explanation:

There are only two times of the year when the Earth's axis is tilted neither toward nor away from the sun, resulting in a "nearly" equal amount of daylight and darkness at all latitudes.

Answer:

Explanation:

The key difference between electropositive and electronegative radicals is that electropositive radicals are radical compounds having the capacity to electrons and carry a positive charge whereas electronegative radicals are radical compounds having the capacity to gain electrons and carry a negative charge.

I hope it's helpful for you

Answer:

4. D

Explanation:

Matter can exist in three states namely: solid, gas and liquid. These three states are individually unique because they possess different properties or characteristics. Matter consists of particles, which behave differently in the different states.

Particles of a liquid e.g water, ethanol etc. will move freely about in the container it is placed but in close contact with one another. This means that the particles move freely while still attached to one another. This accounts for the reason liquids are said to FLOW.

Answer:

Robot 1 : 150 J

Robot 2: 40 J

Explanation:

30 N x 5m = 150 J

20 N x 2m = 40 J

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Answer:

B. Hess's law states that the enthalpy of a reaction does not depend

on the reaction path.

Explanation:

Answer:

density.

Explanation:

A cubic centimeter of water weighs 1 gram. Since a cubic centimeter of vegetable oil weighs less than 1 gram, oil will float on water. Corn syrup is more dense than water so 1 cubic centimeter of corn syrup weighs more than 1 gram. Therefore, corn syrup sinks in water.

Answer:

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H2CO3 + NaOH --> Na2CO3 + H2O

Here salt is Na2CO3.

So, (A) H2O + Na2CO3 is your answer.

Answer:

please follow me

Explanation:

A displacement reaction is the one when a more reactive substance displaces a less reactive one from its salt solution whereas a double displacement reaction is the one where a mutual exchange of ions happens between two compounds.

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Answer: hewo, there! your answer is Below

A single disturbance passing through a medium is called a pulse.

Explanation:

When the disturbances are repeated in a periodic manner, the pulses generate a continuous wave. Longitudinal waves (also called compression waves – a slinky pushed and pulled) – moves parallel (same direction) to the wave motion.

Hope this helps !!

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Answer:

When the energy of a wave passes through the medium, particles of the medium move. The more energy the wave has, the farther the particles of the medium move. The distance the particles move is measured by the wave's amplitude.

Explanation:

A single disturbance passing through a medium is called a pulse. When the disturbances are repeated in a periodic manner, the pulses generate a continuous wave. Longitudinal waves (also called compression waves – a slinky pushed and pulled) – moves parallel (same direction) to the wave motion.

Answer:

Kidneys and Bladder is the organ responsible for getting rid of waste from the human body

Answer:

kidney and bladder

Explanation:

the kidney and bladder are the organs responsible for getting rid of waste in the human body

Answer:

To find out the number of atoms: MULTIPLY all the SUBSCRIPTS in the molecule by the COEFFICIENT. (This will give you the number of atoms of each element.)

Explanation:

Answer:

It helps create saliva.

It regulates your body temperature.

It protects your tissues, spinal cord, and joints.

It helps excrete waste through perspiration, urination, and defecation.

It helps maximize physical performance

Explanation:

When elements combine, they form molecules. Simply put, a molecule is a group of two or more atoms chemically bonded together.

Answer:

The predators would consume the prey population faster than it could be replaced.

Explanation:

According to Oxford dictionary; an ecosystem is "a biological community of interacting organisms and their physical environment."

An ecosystem is a self supporting unit that is composed of living and non living parts. The ecosystem should be self sustaining.

In the particular case mentioned in this question, when the predator population becomes so large, they will steadily diminish the prey population faster it can be replaced thereby distorting the balance of the ecosystem.

Answer:

Length

- centimetre

- millimetre

- kilometre

- meter

Mass

- gram

- kilogram

Capacity

- liter

- millilitre

I don't know why mass is there but hope this helps! :)

Answer: The volume of hydrogen produced is 0.122 L

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]

[tex]\text{Moles of solute}={\text{Molarity}}\times {\text{Volume in L}}[/tex]  

[tex]\text{Moles of} Mg=\frac{5.00g}{24g/mol}=0.208moles[/tex]

[tex]\text{Moles of} HCl=[/tex][tex]0.100moldm^{-3}\times 0.1dm^3=0.01mol[/tex]

The balanced chemical equation is:

[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]  

According to stoichiometry :

2 moles of require = 1 mole of

Thus 0.01 moles of [tex]HCl[/tex] will require=[tex]\frac{1}{2}\times 0.01=0.005moles[/tex]  of [tex]Mg[/tex]

Thus is the limiting reagent as it limits the formation of product and is the excess reagent.

As 2 moles of give = 1 mole of

Thus 0.01 moles of [tex]HCl[/tex] give =[tex]\frac{1}{2}\times 0.01=0.005moles[/tex]  of [tex]H_2[/tex]

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 1.0 atm  (SATP)

V = Volume of gas = ?  

n = number of moles = 0.005

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]25^0C=(25+273)K=298K[/tex] (SATP)

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{0.005mol\times 0.0820 L atm/K mol\times 298K}{1.0atm}=0.122L[/tex]

Thus volume of hydrogen produced is 0.122 L

Answer:

(a) W

(b) X

(c) Y

Explanation:

Let's consider the following table with melting and boiling points for 4 substances.

Substance     Melting Point (°C)       Boiling Point (°C)

     W                       -7                                  60

     X                       660                              2500

     Y                        180                               1330

     Z                         115                                445

Let's consider that:

(a) Which substance is a gas at 100°C?

At 100 °C, W is above the boiling point

(b) Which substance is a liquid for the largest range of temperature?

The largest difference between the melting point and the boiling point is that of X: 2500 - 660 = 1840.

(c) Which substance is liquid at 1000 °C and a gas at 2000°C?​

Y is between the melting and the boiling point at 1000 °C and above the boiling point at 2000 °C.

Answer:

The angle of incoming sunlight varies at different places

Answer: This answer is multiple choices.

1. Land and water have different heat capacities.

And

3. The angle of incoming sunlight varies at different places.

Explanation: I kept seeing other people only putting in one answer, so I used this answer from someone else. Credit to them!